package com.wechat.util;

import java.security.MessageDigest;
import java.util.Arrays;


public class SignUtil {

	
	public static boolean checkSignature(String signature, String timestamp,String nonce) {
		String[] paramArr = new String[] {"tokensong0827", timestamp, nonce };
		Arrays.sort(paramArr);
		String content = paramArr[0].concat(paramArr[1]).concat(paramArr[2]);
		String ciphertext = null;
		try {
			MessageDigest md = MessageDigest.getInstance("SHA-1");
			byte[] digest = md.digest(content.toString().getBytes());
			ciphertext = byteToStr(digest);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return ciphertext != null ? ciphertext.equals(signature.toUpperCase()): false;
	}
	
	public static void main(String[] args) {
		boolean b=checkSignature("79d06d126ee87493e5e2c2a6dd7efa2b8780e91c", "1483633378", "954514000");
		System.out.println(b);
	}

	private static String byteToStr(byte[] byteArray) {
		String strDigest = "";
		for (int i = 0; i < byteArray.length; i++) {
			strDigest += byteToHexStr(byteArray[i]);
		}
		return strDigest;
	}

	private static String byteToHexStr(byte mByte) {
		char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',
				'B', 'C', 'D', 'E', 'F' };
		char[] tempArr = new char[2];
		tempArr[0] = Digit[(mByte >>> 4) & 0X0F];
		tempArr[1] = Digit[mByte & 0X0F];
		return new String(tempArr);
	}

}
